Effect of Carbon Content on Tribological Properties of CrN∶a-C Multiphase Composite Coatings
Multiphase composite coatings CrN∶a-C were deposited by multi-arc ion plating technolo-gy with Cr target,gases N2 and C2H2 as source of Cr,N and C,respectively.The carbon content of the coating can be regulated by adjusting the C2H2 flow rate.The effect of carbon content on the composition,structure,mechanical properties,and tribological properties of CrN∶a-C multiphase composite coatings was assessed by means of X-ray diffractometer(XRD),Raman spectroscope,field emission scanning electron microscope(FE-SEM),and multifunctional friction-wear tester.The results indicated that with the increase of carbon content,the structural characteristics of amorphous carbon of the coating were gradually obvious,while the compactness of the coating was decreased,which leads to the gradual de-crease of the mechanical properties,but it still shows a higher hardness and adhesive strength to the sub-strate.CrN:a-C multiphase composite coatings exhibited better characteristics of low coefficient of friction and low wear rate during dry friction and friction in the presence of lubricating oil 5W-30,which are affect-ed by carbon content and friction products.The coefficient of friction(CoF)and wear rate increase first and then decrease in conditions of dry friction and friction with lubricating oil respectively.Among others,the coating prepared by the C2H2 flow rate of 120 sccm presented CoF of 0.33 and 0.12,and wear rate of 1.3 × 10-5 mm3/(N·m)and 7.4 × 10-6 mm3/(N.m)in conditions of dry friction and friction with lubricating oil respectively,which was expected to provide effective anti-friction and anti-wear protection for friction pair.
surface and interface of materialCrN∶a-C multiphase composite coatingchromium ni-trideamorphous carbontribological properties
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